/*
 * Copyright © 2016-2017 European Support Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.openecomp.core.impl;

import org.apache.commons.collections4.CollectionUtils;
import org.openecomp.core.converter.errors.CreateToscaObjectErrorBuilder;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.utils.CommonUtil;

import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class ToscaConverterUtil {

  private static final String DEFAULT = "default";
  private static final String DEFAULT_CAPITAL = "Default";
  private static final Set<String> DEFAULT_VALUE_KEYS;

  static {
    DEFAULT_VALUE_KEYS =
        Stream.of(DEFAULT, DEFAULT_CAPITAL).collect(Collectors.toSet());
  }

  private ToscaConverterUtil() {
    // static utility methods only, prevent instantiation
  }

  static <T> Optional<T> createObjectFromClass(String objectId,
                                               Object objectCandidate,
                                               Class<T> classToCreate) {
    try {
      return CommonUtil.createObjectUsingSetters(objectCandidate, classToCreate);
    } catch (Exception ex) {
      throw new CoreException(
          new CreateToscaObjectErrorBuilder(classToCreate.getSimpleName(), objectId)
              .build(), ex);
    }
  }


  static Optional<Object> getDefaultValue(Object entryValue,
                                       Object objectToAssignDefaultValue) {
    if (!(entryValue instanceof Map)
        || Objects.isNull(objectToAssignDefaultValue)) {
      return Optional.empty();
    }

    return Optional.ofNullable(getDefaultParameterValue((Map<String, Object>) entryValue));
  }

  private static Object getDefaultParameterValue(Map<String, Object> entryValue) {
    Object defaultValue = null;
    Set<String> keys = new HashSet<>(entryValue.keySet());
    keys.retainAll(DEFAULT_VALUE_KEYS);

    if (CollectionUtils.isNotEmpty(keys)) {
      defaultValue = entryValue.get(keys.iterator().next());
    }

    return defaultValue;
  }
}
